Effects Of H. Scandens Ethanal Extracts On Growth Performance And Immunity Of AA Broiler Chickens

Humulus scandens (Lour.) Merr(H. Scandens) is a kind of Chinese herbs. In thispaper, three experiments were conducted to study the effects of H. Scandens ethanolextracts on growth performance, alimentary tract pH, digestive enzyme activity, villusheight, serum biochemical parameters and some immune indexes of broiler chickens forthe purpose of estimating the applied value of H. Scandens in feed.2401-day-old AAbroiler chickens were randomly divided into4treatments with6replicates for10birdseach. From1to42d of age, the diets with0(the control group),5(experimentalgroupⅠ),10(experimental groupⅡ) and15mL/kg (experimental group Ⅲ) H. Scandensethanol extract were given.Exp.1To investigate the effects of H. Scandens ethanol extracts on growth performance,carcass characteristics and meat quality of broiler chickens, and finally get the optimumadding dose. The results showed that: compared with the control group, experimentalgroupⅡ could significantly (P＜0.05) decrease body weight gain, and significantly (P＜0.05) improve dressed carcass rata, eviscerated rate, muscle meat and breast-thigh meatpercentage, and respectively improved by0.82%,3.44%,10.43%,6.53%; Compared withthe control group, experimental groupⅡ couldsignificantly (P＜0.05) improve L~*andA~*, could significantly (P＜0.05) reduce shear force of leg muscle and water loss rateof breast muscle,. Therefore we could draw a conclusion that H. Scandens ethanolextracts could improve growth performance and carcass characteristics, and made themeat fresher, brighter and tenderer.Exp.2To investigate the effects of H. Scandens ethanol extracts on alimentary tract pH,digestive enzyme activity and villus height of broiler chickens. The results showed that:compared with the control group, experimental groups could significantly(P＜0.05)lower the pH of proventriculus, gizzard, jejunum and ileum, but the effects on the pH ofcrop, ceca and rectum were not significant (P＞0.05), experimental groups couldsignificantly (P＜0.05) increase the pH of duodenum; Compared with the control group,experiental groups could significantly (P＜0.05) increase pepsin activity in gizzard,amylase activity, lipase activity and trypsin activity in duodenal chime; Compared withthe control group, experimental groups could improve the duodenum, jejunum and ileumvillus height, and the improvement on duodenum villus height was significant (P＜0.05).Exp.3To investigate the effect of H. Scandens ethanol extracts on serum biochemical parameters, immune organ index and the number of mast cells of broiler chickens. Theresults showed that: compared with the control group, experimental groups could reducethe activities of GPT (serum glutamic-pyruvic transaminase), GOT (serumglutamic-oxaloacetic transaminase), CPK (serum creatinine phos-phkinaes), but due to anot significant reduction (P＞0.05); Compared with the control group, experimentalgroups could significantly (P＜0.05) improve the activity of AKP (serum alkalinephosphatase), while significantly (P＜0.05) decrease the content of TC (serum totalcholesterol) and TG (serum total cholesterol); Compared with the control group,experimental groups could significantly (P＜0.05) increase the amounts of serum totalprotein, serum globulin and serum phosphorus, while the improved effects on serumalbumin and calcium were not significant (P＞0.05); Compared with the control group,experimental groups could increase spleen index and bursa of fabricius index, but notsignificantly(P＞0.05); Compared with the control group, experimental groups couldsignificantly (P＜0.05) increase the number of mast cells in duodenum, jejunum andileum.the optimum adding dose of H. Scandens ethanol extracts was10mL/kg.